Incandescent lamp.



PATENTE D NOV. 5

H. BOEHM.

INUANDESGENT LAMP.

APPLICATION FILED NOV.21, 1906.

' UNITED STATES HERMAN BOEHM, OF YOUNGSTOWN, OHIQ mariner o FioE.

INCANDESQENT LAMP.

To all. whom it may concern:

Be it known that I, HERMAN BOEHM, of Y oungstowm' in the county of Mahoning and State of Ohio, have invented certain new anduseful Improvements in Incandescent Lamps; and I do hereby declare the following to be a full, clear, and'exact description ofthe invention, such as'wi ll enable othersskilled in the art towhich it appertains to make and use the same.

In LettersPatent of the United States No.693,222,

circuiting and danger of. breaking the wires.

.' Fig. 4 shows a. slight modification.

The objects of my present improvementare to render the axial turning of the lamp, while in engagement with the terminal springs, impossible; to lessen the cost of manufacture; and to so form the head or end of the bulb as to'limit the insertion thereof into its socket, and at the same time provide for a. maximum dissemination of the light.

The invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawing, Figure I is a plan view. Fig. 2 is a cross sectional view, on line 22, Fig. 1. Fig. 3 is a longitudinal sectional view showing the terminal springs in engagement with .the lamp.

In the present instance the lamp bulb 1, which is mainly cylindrical, is formed with opposite flattened sides 2 which extend a. short distance from one end of the bulb, as shown in 1 and 3, or substantially the Specification of Letters Patent. Application filed November 21.1906. Serial No. 344.496.

Patented Nov. 5, 19.07.

full length thereof, as shown in Fig. At the mount ends ofv the flattened sides are small grooves? to accommodate the leading-in wires 4. Those portions of the latter which extend over the flattened sides of the bulb are themselves flattened, as shown at 5,- andfastened to such sides by cement or any other suitable means.

Preferably these flattened ends of the leading-in wires are extended the full length of the flattened sides of the bulb, but the extent to which they are carried over the latter is immaterial. The terminal springs 6 when in engagement with the flattened wires and flattened sides of the bulb will hold the latter firmly in place, preventing it fromturning, and avoiding short circuit ing.

For the purpose of providing a stop to limit the insertion of the bulb and at the same time to provide for greater dissemination of the light, the outer end 7 of the bulb is bulged or of hemispheroidal shape, such enlargement forming shoulders which act as stops.

The advantages of.my invention are apparent. It is manifest that the present improvements insure against the danger of the bulb being displaced in its socket once the flat surfaces are engaged by the tcr- I 

